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Bob Mather

Hi Simon,
In my old reply on 18mm A6 NGK plugs I stated they could be machined down to increase the reach. I no longer recommend this as it leaves very little metal and it is easy to shear off plugs, I have seen a friend do it.
In my opinion the best way is to Helicoil the plug holes down to 14 mm.
I did this and found an unused pair of KLG FE 65P thats 14mm, longreach (3/4) inch and extended nose. These plugs have been in over 3200 miles and not given an ounce of trouble
Bob Mather.